Oxidation resistance of Co-Ni-xNiFe2O4 as potential inert anodes

Xukun Qian; Mo Zhang; Chuncheng Zhu; Xiaodong He

doi:10.1117/12.780298

31 October 2007 Oxidation resistance of Co-Ni-xNiFe₂O₄ as potential inert anodes

Xukun Qian, Mo Zhang, Chuncheng Zhu, Xiaodong He

Proceedings Volume 6423, International Conference on Smart Materials and Nanotechnology in Engineering; 64234N (2007) https://doi.org/10.1117/12.780298
Event: International Conference on Smart Materials and Nanotechnology in Engineering, 2007, Harbin, China

Abstract

Co-Ni-xNiFe₂O₄(x=5, 10, 15 and 20wt %) metal-based composite materials were prepared by pressureless sintering method, and were investigated for potential applications as inert anodes in aluminum electrolysis. The oxidation resistance of the as-prepared samples was experimented under air condition at 960°C. An approximately parabolic rate evolution was found in the curves of oxidized dynamics, and the oxidation rates become much slower when a compact oxide scale is formed. The oxide scales are mainly comprised of CoO·3NiO as identified by x-ray diffraction patterns (XRD). The oxide scales grow by the inward diffusion of oxygen and the simultaneous outward diffusion of nickel and cobalt ion. The surface and fracture morphologic observation of the oxidized sample was carried out by scanning electron microscope (SEM). It is found the oxide scale-substrate interface straight and there is small crack along the interface. The adhesion of oxide scale to the metal substrate is not so good. Finally it is concluded that the sample with 20wt% NiFe₂O₄ exhibits the best oxidation resistance by comparison.

Citation Download Citation

Xukun Qian, Mo Zhang, Chuncheng Zhu, and Xiaodong He "Oxidation resistance of Co-Ni-xNiFe₂O₄ as potential inert anodes", Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64234N (31 October 2007); https://doi.org/10.1117/12.780298

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